Immunohistological study of two malignant lymphomas found as testicular tumors.

: Immunohistological studies of two testicular lymphomas are reported. In the first case, lymphoma cells bear T-cell markers such as Leu-4 and Leu-3a, while they do not react with antibodies against B-cell markers such as anti-Leu-14. In the second case, lymphoma cells do not react with anti-T or anti-B cell antibodies, but react with antibodies against B-4, OKT9, and C 13 (anti-HLA-DR). Thus, it is shown that the first case is a lymphoma of helper/inducer T-cell origin and the second case is a pre-B-cell or pre-pre-B-cell lymphoma.